Engine Titanium Consortium - Center for Nondestructive Evaluation ...
Engine Titanium Consortium - Center for Nondestructive Evaluation ...
Engine Titanium Consortium - Center for Nondestructive Evaluation ...
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FOM (std. units)<br />
0.20<br />
0.18<br />
0.16<br />
0.14<br />
0.12<br />
0.10<br />
0.08<br />
0.06<br />
H5 Side 4 FOM (using meas. atten)<br />
Gate #1<br />
Gate#2<br />
Gate#3<br />
Gate#4<br />
Gate#5<br />
gate#6<br />
0.04<br />
0.02<br />
0.00<br />
5.0 10.0 15.0 20.0<br />
Frequency (MHz)<br />
RMS Noise (Volts)<br />
0.030<br />
0.025<br />
0.020<br />
0.015<br />
0.010<br />
0.005<br />
HW5 Side 4 RMS Noise<br />
Gate <strong>Center</strong> Duration<br />
G1 2.61 us (0.32”) 2.55 us<br />
G2 3.61 us (0.44”) 1.27 us<br />
G3 4.61 us (0.56”) 1.27 us<br />
G4 5.61 us (0.69”) 1.27 us<br />
G5 6.61 us (0.81”) 1.27 us<br />
G6 3.90 us (0.48”) 5.11 us<br />
G1<br />
G2<br />
G3<br />
G6<br />
G4<br />
G5<br />
0.000<br />
0 1 2 3 4 5 6 7 8 9 10<br />
Time after Front Wall Echo (usec)<br />
Figure 5. Measured grain-noise FOM values, as functions of frequency, <strong>for</strong> the Honeywell highnoise<br />
<strong>for</strong>ging coupon. The largest FOM values were seen <strong>for</strong> analysis Gate #3, centered about<br />
0.56” below the entry surface. The locations of the various gates used in the analysis of noise A-<br />
scans are shown in the rightmost panel which displays the measured rms noise level as a function<br />
of time. A 15-MHz, F7 focused transducer was used, and the peak in the rms noise curve<br />
corresponds to scattering by grains located in the focal zone.<br />
Quarterly Report – January 1, 2002 –March 31, 2002<br />
print date/time: 6/6/2002 - 8:39 AM – Page 40
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